searchscore.cpp

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/*---------------------------------------------------------------------+
 * File: searchscore.cpp
 * Project: part of belofte - A Promising Chess Program
 * Author: yves
 * SPDX-License-Identifier: GPL-2.0-only
+----------------------------------------------------------------------*/
 
#include "belofte.h"
 
/**
 * converge score towards zero in order to force immediate best move
 * first
 */
bScore bSearchScore::convergeScore(bScore const score)
{
  if (score > 0) {
    if (score > SCORE_ALMOST_NORMAL) {
      if (score == SCORE_PUNDEFINED) return SCORE_UNDEFINED;
      return score;
    }
    if (score < SCORE_ALMOST_DRAW) return score;
    return score - SCORE_CONVERGE_BYDEPTH;
  } else if (score < 0) {
    if (score < -SCORE_ALMOST_NORMAL) {
      if (score == SCORE_PRACTICAL_DRAW) return SCORE_THEORETIC_DRAW;
      return score;
    }
    if (score > -SCORE_ALMOST_DRAW) return score;
    return score + SCORE_CONVERGE_BYDEPTH;
  }
  return score;
}
 
bSearchScore bSearchScore::operator-() const
{
  if (!m_type) {
    if (m_score > SCORE_PUNDEFINED || m_score < SCORE_UNDEFINED) return *this;
    return bSearchScore(-m_score);
  } else if (m_type == tScoreType::SC_ALPHA) {
    return bSearchScore(-m_score, tScoreType::SC_BETA);
  } else if (m_type == tScoreType::SC_BETA) {
    return bSearchScore(-m_score, tScoreType::SC_ALPHA);
  }
  return bSearchScore(-m_score, m_type);
}
 
bSearchScore::operator std::string() const
{
  if (!m_type) {
    return engineInterface::scoreAsString(m_score);
  } else if (m_type == tScoreType::SC_ALPHA) {
    return ALPHA ": " + engineInterface::scoreAsString(m_score);
  } else if (m_type == tScoreType::SC_BETA) {
    return BETA ": " + engineInterface::scoreAsString(m_score);
  }
  return engineInterface::scoreAsString(m_score);
}
 
//-----------------------------------------------------------------------
 
// eof